I have i set of e90 and 2 sets of e92 Meisterschaft GTC in stock ready to ship.

Te exhausts features a progressive electronic valve mechanism where you can set the volume of your exhaust to any level you desire.

With the valves fully closed you will get the sound that is slightly louder then stock. With the valve fully open you will get the sound close to the Meisterschaft GT2 setup. the valve is operated by a switch and can be precisely controlled. The longer you hold the switch, the more the valve opens up. That gives you an ability to fine-tune the sound of your exhaust in the range of almost stock to GT2-loud.